but which leaves with having to turn up the empeg volume to more or less 0dB depending on the file beeing played ...

When playing on your in-home amplifier, the Empeg should always be set to 0db, and the volume should be controlled at the Amp. This is normal.

When working in the house, the Empeg should be treated like any other line-level stereo component, such as a CD player, a VCR, or a DVD player. Note that those products don't have their own individual volume controls, they are always playing at 0db. The Empeg should be treated the same way.

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Tony Fabris